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using System.Runtime.InteropServices;
public class Board{
  [DllImport("coredll.dll")]
  private static extern int SipShowIM(SIPStatus i);
 
  private enum SIPStatus
  {
    SIPF_OFF =0 ,
    SIPF_ON 
  }

  public static void Show()
  {
    SipShowIM(SIPStatus.SIPF_ON);
  }
  public static void Hide()
  {
    SipShowIM(SIPStatus.SIPF_OFF);
  }
}